5f,h open-drive compressors – Carrier 5F User Manual
Page 39
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HEATING A COOLING
5F,H
Open-Drive Compressors
TROUBLESHOOTING (cont)
TROUBLE/SYMPTOM
PROBABLE CAUSE
REMEDY
Low oil pressure, (cont)
Clogged oil line.
Remove obstruction.
Worn oil pump.
Replace pump assembly.
Worn compressor bearings.
Replace.
Cold compressor.
Liquid carryover from evaporator.
Check refrigerant charge and expansion
valves.
Low crankcase oil level.
Oil return check valve stuck closed.
Repair or replace check valve.
Cylinders and crankcase
sweating.
Refrigerant floodback.
Check refrigerant charge and expansion
valves.
High crankcase temperature
(should be 150 F to 160 F
max. at seal housing).
Liquid line strainer clogged.
Clean strainer.
Excessive superheat.
Reset expansion valves.
Compression ratio too high.
Recheck design.
Discharge temperature over 275 F.
Check unit application.
Leaking suction or discharge valves.
Replace valves.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
. BookI 2
PC 111
Catalog No 530-526
Printed i n U S A
Form5F,H-11SI
Pg 39
2-86
Replaces: 5F,H-9SI
For replacement items use Carrier Specified Parts
Tab 2a